Improvement in fruit-jars



J. I... MASON.

FRUIT-JAR.

No.,189,3716. Patented April 1o, 1877.

UNITED STATES- PATENT OFFICE.

JOHN L. MASON, OF NEW BRUNSWICK, -NEW JERSEY.

IMPROVEMENT IN FRUIT-JARS.

Specification forming part of Letters Patent No. 189,316, dated April 10, 1877; application iiled I December 30, 1876.

- lowing to be a clear and exact description of the nature thereof, sufficient to enable others skilled in thel art to which my invention appertains to fully understand, make, and use the same, reference being had to the accom-- panying drawings, making part ot this speciication, in which- Figure lis a side elevation of the device embodying` my invention. Fig. 2 is a central vertical section of the top or cover. Fig. 3 is a central vertical section of a portion ot' Fig. l.

Similar letters of reference indicate corresponding parts in the several figures.

My invention consistsA in a preserve jar cover having on its under side, near the circumference thereof, a wedge-shaped channel, from the base of which` projects downwardly ai'rib, in combination with a gasket, which encircles the top ange of the body of an ordinary screw-neck preserve-jar, and projects above said flange, whereby, when the cap or lock is screwed on the body, the gasket is compressed vertically and expanded laterally, the wedge shape ot' the channel increasing the space for the occupation of the expanded gasket, and the rib increasing the lateral expansion of the gasket, so that the Wedgingchannel will be entirely filled by the gasket in yan expanded state without solidification, the gasket isolated from the contents of the jar, and the joint between the cover and bodyv of the jar made tight and serviceable.

Referring tothe drawings, A represents the body ot' a fruit or preserve jaryB, the screw-neck, and O the top flange thereof. D represents a gasket, which is laid on the top oil the neck B, and, encircling the liange O, projects above the latter. G represents a cover or stopper, which is held to the jar by means of the screw cap or lock, H. On the under side of the cover is formed a channel, J, which is of tapering orwedging form, the widest part being below, and on the same side of the cover there is also formed a rib, K, which projects into the channel J.

When the gasket is properly located and the cover G placed in position thereon, the top of the top of the gasket projects into the channel J, as seen in Fig. 3. y

lWhen the screw cap or lock is fitted on the jar and tightened the gasket will be compressed, and thus expanded,4 whereby the channel J, being of wedging form, will be entirely filled by the gasket, and thus the joint will be tight and serviceable.

This operation will be assisted by the action ot' the rib K, which will serve to further expand the top of the gasket in the narrowest part of the channel J.

It will be seen that the two sides or Walls and base of the channel will have the gasket firmly compressed thereagainst, whereby the reliablesealing of the jar is insured.

Iam aware that it is not new to form on the under side of the cover-of the jar a rib or thread which bears against the gasket below the top of the flange of the body of the jar. I am also aware that it is not new to specially construct a jar with a V-shaped groove on its upper face. 1

By my invention I overcome the defect of the former case, wherein the gasket has no space to expand, and it becomes solid, thus limiting the downward motion of the cap or cover.

In the other case the gasket will expand and spread horizontally in the joint between the cover and top edge of the body, and at the same time the gasket will come in contact with the fruit. Moreover, the jar has to be specially constructed; but I employ the gasket D, encircling the top flange O of thejar, and. projecting above said flange, all constructed, arranged, and operating substantiallyas and for the purpose set forth.

. JOHN L. MASON.

Witnesses:

JOHN A. WIEDERSHEIM, A. P. GRANT. 

